diff --git a/tox.ini b/tox.ini
index 377a8be7..4c4e50d6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,7 +8,7 @@ ignore_basepython_conflict = True
 basepython = python3
 usedevelop = True
 install_command =
-    pip install -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
+    pip install -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master} {opts} {packages}
 commands =
     /usr/bin/find . -type f -name "*.pyc" -delete
 passenv =
@@ -117,7 +117,7 @@ commands =
 
 [testenv:molecule]
 setenv =
-    UPPER_CONSTRAINTS_FILE=/dev/null
+    TOX_CONSTRAINTS_FILE=/dev/null
 deps =
     ansi2html  # GPL (soft-dependency of pytest-html)
     docker>=3.7  # Apache